Folded paper box



May 7i@ T929 l.. E. ARNESON FOLDED PAPER BOX Filed Nov. 22, 1926 f l i Patented May 7, 1929.

UNITED STATES- PATENT oFFlcfE.

LAWRENCE EDWIN ARNESON, OF MORRIS, ILLINOIS, ASSIGNOR TO MORRIS IAPEB MILLS, OF CHICAGO, ILLINOIS,'A CORPORATION OF ILLINOIS.

FOLDED PAPER BOX.

-lApplicaltion lcd November Thisv invention relates to folded Vpaper boxes, and more particularly to the type of box made from a pape'r blank which is cut and folded in a manner to permit the box to be readily set up and locked in set up position. l

One of the objects of my invention is to provide a box which is cheap, simplein construction, 4yet durable and eiicient .in service.

Another objectof my invention is to provide a box which may be made from a single' blank, the blank being folded along hinged lines to form the side and end walls and being provided with parts which coopcrate to hold the box in locked position when it is once set up, the cooperating parts assuming their engaging positions of their own accord when the box is folded into the proper set up position.

Another obJect of my invention is to prof vide a box made from a paper blank having a main panel`and side and end panels hinged to the edges thereof, the end panels being provided with end flaps which are adapted to be folded tovoverlie the end panels and to enclose fiaps on the ends of the side panels, and being further provided with a locking flap on its inner edge adapted to assume a position parallel to the main panel and to engage the inner side thereof when the box is folded in set up position, the locking Hap having wedged extensions at its edges which on beingr pushed into position wedge against the side panels and finally become automatically seated and locked in slits provided at the hinge between the side panels and the main panel in a .manner to lock the box in set up position.

A further object of my invention is to provide a box of the type described in the above stated objects in which the locking iap is disposed at right angles to the end panel in a manner to form a reinforce for the end panel and the overlapping iap provided on said end panel.

These and otheriobjects are accomplished by n'ieans of the arrangement disclosed on Y22, 1926. Serial No. 149,841.

the* accompanying sheet of drawings, l in which-- Figure 1 is a: plan View of the paper blankV Figure 4 is a cross sectional view of onev corneiof the box in Aits set up relation, disclosing the locking flap and the end panel construction, and represents a showing taken on line 1M-4* of Figure 3, and

.Figure 5 is another view of a corner of the box but taken from a position which is at a 90 angle to that shown in Figure 4 and being taken on line 5"-5x of Figure 3.

The various novel features of the invention will be apparent from the following description and drawinr and will be particularly pointed out in the appended claims. Referring to the drawings, it will be noted that the blank from which my box is folded comprises a single piece of paper or cardboard 10 having a central portion 11 form ing a main panel which will ultimately form the top or bottom portion of the box, the main panel 11 being provided with end panels 12 and side panels 13, these four panels being integral with the main panel but separated by hinge portions or folds in the blank shown at 14. Provided at the ends of the side panels 13 are fiaps 15 integral with the side panels but being hinged at 16 so that they may be bent at right angles thereto. On the upper edge of the end panels 12, an end flap portion 17 is provided integral therewith but hinged as at 18 so that it may be folded inwardly upon the" flap 12 in a manner to enclose the flaps 15 and to hold the flaps 15 and the sideand end panels respectively in set up position. Provided on the hinge `portions 14 which join the side panels 13 to the mainpanel 11, four slits 19 are provided which are preferably formed with the cross cuts in a manner to form a tongue portion 21 in the side panels. Hinged to thev outer end of the end flap portion 17 isa locking flap 22,

hinged as at 23 to the end flap 17 and integral therewith and being provided with wedge shaped extensions 24 at each end, as shown in Figure 1. Attention is called to the'fact that the slit 25 is provided so as to tend slightly on the opposite sides of the hinge 14. This is found to produce a very 'eiliclent form of locking slit and permits greater freedom of movement of the tongue portions 21, but it is to be readily understood that the extension of the cross cuts is not absolutely essential, it merely being necessary in practicing the present invention 'to provide slits extendin parallel to the main panel of a size and ocation to accommodate the extensions of the locking ila 22. The box portion formed ,from the a ove described blank constructed in accordance with my invention is readily set up from the blank, the hinges or folded ortions being made by scoring or provi ing flexible bend so as to render the various panels relatively easy to fold into their respective positions, and the locking means bei-ng of such a structure that the parts automatically assume their locked positions when they are folded along the various bends into set up relation. It will be observed that according to Figure 3, when the box is set up the flaps 15 are enclosed between the end panel 12 and the end flaps 17 and that the locking flap 22 is ositioned at right angles to the end iiap 17 and engages the inner surface of the main panel 11 with its end wedge portions 24 positioned in the slits 19 in a manner` to bulge the flap 21 and abut the side panel edgewise as at 25.

lVhen it is desired to assemble the box,

it is merely necessary to bend the side anels 13 at right angles to thelpanel y11, fo d the corner flaps 15 into a position to abut the inner surface of the end panel. 12 after the end panel has, been bent up at right angles in the same manner as panel 13. When this .is done, the end flap 17 is folded over inwardly and is forced to overlie the panel 12 and to enclose the flaps 15, and in this course of movement, in view of the fact that the flap 17 is equal in height to the panel 12, the locking flap 22 engages the inside of the main panel'11 before the end Hap 17 is completely seated. The continued movement of the end flap 17 causes a bending on the hinge 23 so that the locking flap 22 assumes a position at rightan les to the end flap 17 and engages the insi e of the main panel 11 in a plane parallel thereto. Durin'g the course of this movement, the wedge extensions 24 on the ends cause a slight bulging of the side panels 13 and effect a separation thereof in opposition to the tendency of the side panels to remain in vertical position by virtue of the natural resiliency of the material, until the wedge portions reach the slots 19 at which time they automatically displace the iaps 21 and engage edgewise the side panel 13 at the portion 25. It can be readily Aunderstood that the locking flap 22 forms a reinforce for the'end flap 17 and causes the parts to maintain their position as the displacement of the flaps 17 requires a bending of the locking flap 22 in the plane parallel to the main panel. This affords not esv only a very durable and satisfactory form of" set up box but is one that will permit the blanks to be readily set up and to be atomatically locked in set up relation when the parts are merely folded into their final position.

I claim:

1. In a folded paper box, a blank of bendable material comprising a main panel having side and end panels inte ally hinged thereto at its margins, said si e panels hav- 'ing inturned flaps at their ends andl said blank being provided with a locking slit at v the joining fold between said side panel and said main panel, said end panel being composed of three sections, the outermost being vprovided with wedge shaped lateral extensions adapted to engage in said slit whereby the two inner sections .of said end panel may be bent one u 7on the the other to enclose said inturned aps and to present said outermost portion-in parallelism with said main panel with said-wedge extensions positioned in said slits to form a box.

' `2. In a folding box, a blank of bendable material comprising a main panel and side and end panels hinged thereto, said side anels having inturned flaps adapted to be eld by said end panels and being further provided with locking slits adjacent their jointure with said main panel, said end panels shaped extensions and adapted to be bent over to enclose `said inturned flaps and to cause said locking flaps to engage the inside of said main panel so that the continued movement of the end panel into proper position causes the locking flap to assume a position parallel to said main panel and said extensions to automatically enter said slits by a wedging action to lock the parts in set up relation.

3. In a folded paper box, a blank of bendable material comprising a main panel having side and end panels integrally hinged thereto at its margins, said side panels having extensions adapted to be inturned against said end panels, said blank being otherto enclose said extensions carried by provided with locking slits at the joining said side panels and to present said outer- 10 folds between said side panels and said main most portion in parallelism with said main panel7 said end panel being composed of panel with said lateral extensions positioned 5 three sections, the outermost being provided in said slits to form a box.

With lateral extensions adapted to engage in Signed at Morris, Illinois, this 15th day said slits whereby the two inner sections of of November, 1926. said end panel may be bent one upon the LAWRENCE E. ARNESON. 

